He Detects In It Some Siliceous-Shielded Fresh-Water
Infusoria, And No Less Than Twenty-Five Different Kinds
Of The Siliceous Tissue Of Plants, Chiefly Of Grasses.
From
the absence of all carbonaceous matter, Professor Ehrenberg
believes that these organic bodies have passed through the
volcanic fire, and have been erupted in the state in which
we now see them.
The appearance of the layers induced me
to believe that they had been deposited under water, though
from the extreme dryness of the climate I was forced to imagine,
that torrents of rain had probably fallen during some
great eruption, and that thus a temporary lake had been
formed into which the ashes fell. But it may now be suspected
that the lake was not a temporary one. Anyhow, we
may feel sure, that at some former epoch the climate and
productions of Ascension were very different from what
they now are. Where on the face of the earth can we find
a spot, on which close investigation will not discover signs
of that endless cycle of change, to which this earth has been,
is, and will be subjected?
On leaving Ascension, we sailed for Bahia, on the coast
of Brazil, in order to complete the chronometrical measurement
of the world. We arrived there on August 1st, and
stayed four days, during which I took several long walks.
I was glad to find my enjoyment in tropical scenery had not
decreased from the want of novelty, even in the slightest
degree. The elements of the scenery are so simple, that they
are worth mentioning, as a proof on what trifling circumstances
exquisite natural beauty depends.
The country may be described as a level plain of about
three hundred feet in elevation, which in all parts has been
worn into flat-bottomed valleys. This structure is remarkable
in a granitic land, but is nearly universal in all those
softer formations of which plains are usually composed.
The whole surface is covered by various kinds of stately
trees, interspersed with patches of cultivated ground, out
of which houses, convents, and chapels arise. It must be
remembered that within the tropics, the wild luxuriance of
nature is not lost even in the vicinity of large cities: for
the natural vegetation of the hedges and hill-sides overpowers
in picturesque effect the artificial labour of man.
Hence, there are only a few spots where the bright red
soil affords a strong contrast with the universal clothing
of green. From the edges of the plain there are distant
views either of the ocean, or of the great Bay with its
low-wooded shores, and on which numerous boats and canoes
show their white sails. Excepting from these points, the
scene is extremely limited; following the level pathways,
on each hand, only glimpses into the wooded valleys below
can be obtained. The houses I may add, and especially the
sacred edifices, are built in a peculiar and rather fantastic
style of architecture. They are all whitewashed; so that
when illumined by the brilliant sun of midday, and as seen
against the pale blue sky of the horizon, they stand out more
like shadows than real buildings.
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